cross-posted from: https://programming.dev/post/37149554
If you have an iPhone 15 Pro or later with iOS 26+, the summary is created on your device using Apple Intelligence. On other devices with earlier iOS versions, the page text is sent securely to Mozilla cloud-based AI, which creates the summary and sends it back.
I'm surprised you (incorrectly) assume that iOS build (which, per Apple's regulations, is just a Safari with a different skin on top of it) comes with a feature that's not available on the main Android build unless you jump through hoops.